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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '206b263ffb2ee77136531e17b3d5bf28c1fb642dcce91afc8f023d9893c90391' 
  AND token = 'nU6cGSIYlQlaZMTc5H4b5R+sAUUmLlRRlhMLvTM2oh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}